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3946

Half-Bridge Power MOSFET Controller

A3946KLB SOIC

Data Sheet

29319.150

VREG

CP2

CP1

PGND

GL

S

1

2

3

4

5

6

7

8

16 VBB

15 VREF

14 DT

13 LGND

12 RESET

11

IN2

The A3946 is designed speci鏗乧ally for applications that require

high power unidirectional dc motors, three-phase brushless dc motors, or

other inductive loads. The A3946 provides two high-current gate drive

outputs that are capable of driving a wide range of power N-channel

MOSFET

s. The high-side gate driver switches an N-channel

MOSFET

that controls current to the load, while the low-side gate driver switches

an N-channel

MOSFET

as a synchronous recti鏗乪r.

A bootstrap capacitor provides the above-battery supply voltage

required for N-channel MOSFETs. An internal charge pump for the

high side allows for dc (100% duty cycle) operation of the half-bridge.

The A3946 is available in a choice of two power packages: a

16-lead

SOIC

with copper batwing power tab (part number suf鏗亁

LB),

and a 16-lead

TSSOP

with exposed thermal pad (suf鏗亁

LP).

Scale 1:1

GH

BOOT

10 IN1

9

~FAULT

A3946KLP TSSOP with Exposed Thermal Pad

VREG

CP2

CP1

PGND

GL

S

GH

1

2

3

4

5

6

7

8

16 VBB

15 VREF

14 DT

13 LGND

12 RESET

11 IN2

10 IN1

9 ~FAULT

Scale 1:1

BOOT

FEATURES

On-chip charge pump for 7 V minimum input supply voltage

High-current gate drive for driving a wide range of

N-channel

MOSFET

s

Bootstrapped gate drive with charge pump for 100% duty cycle

Overtemperature protection

Undervoltage protection

鈥?0潞C to 135潞C ambient operation

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, V

BB

.............................

60 V

Logic Inputs ..................................鈥?.3

V to 6.5 V

Pin S鈥︹€? .........................................鈥?

V to 60 V

Pin GH ...........................................鈥?

V to 75 V

Pin BOOT鈥?. ................................鈥?.6

V to 75 V

Pin DT ........................................................

V

REF

Pin VREG ......................................鈥?.6

V to 15 V

Package Thermal Resistance, R

JA

A3946KLB.....................................

48擄C/W

1

A3946KLB.....................................

38擄C/W

2

A3946KLP .....................................

44擄C/W

1

A3946KLP .....................................

34擄C/W

2

Operating Temperature Range, T

A

..

鈥?0擄C to +135擄C

Junction Temperature, T

J

...........................+150擄C

Storage Temperature Range, T

S

....-55擄C

to +150擄C

Always order by complete part number:

Part Number

A3946KLB

A3946KLP

Package

16-Lead SOIC; Copper Batwing Power Tab

16-Lead TSSOP; Exposed Thermal Pad

Notes:

1. Measured on a two-sided PCB with 3 in.

2

of

2 oz. copper.

2. Measured on JEDEC standard High-K board.

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